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Primary Control Unit
Date Last Saved: 3/23/2012 9:30:04 AM

Product Name(s): ASIC/2-8540-BAC
Product Description: The ASIC/2-8540 is a configurable unitary controller used for energy management or control of air handlers, chillers, cooling towers, pumps, lighting, or other equipment. The ASIC/2-8540 comes with a battery-backed clock. This controller can be configured to communicate peer-to-peer with other ASIC/2 controllers over the system bus. It can also poll ASIC/1 controllers on a separate local bus.
Product Application(s): Applications range from control of rooftop units or small air handling units on a network to stand alone control of a small building.
Point Quantity Characteristics
Analog Input (AI): N.A.
Digital Input (DI): N.A.
Universal Input (AI or DI): 8 0-5 VDC, 0.1% full scale
Analog Output (AO): 4 0-10 VDC, 20mA @ 9.4 V, 14 mA @ 10 VDC
Digital Output (DO): 8 Form 'C' Relays, 24 V, 1 A
Universal Output (UO): N.A.
Control Unit Model #:AIDIUIDOAOUOOther
ASIC/2-8540-BAC 8 8 4
A/D Converter Resolution
8 bit
10 bit
12 bit
16 bit
Other Information not provided.
D/A Converter Resolution
6 bit
8 bit
10 bit
No Analog Output
Other Information not provided.
HOA switches provided on each output?
Note: These are also available as an add-on from 3rd party vendors.
Both AO and DO
DO Only
Indicating status LED on each output?
AO and DO
AO Only
DO Only
Integral Flow Sensor? N.A.
Integral Damper Actuator? N.A.
Can controller accept occupant override from thermostat? N.A.
Can controller accept occupancy sensor input? N.A.
Expander Boards None
Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
(2) EIA-485, BACnet MS/TP @ up to 76.8 kbps, ASI Proprietary protocol @ up to 38.4 kbps
External Communication Ports, Speeds and Access Devices (1) EIA-232 for modem connection or Etherlink connection.
Additional Information (Optional)
Network Accessing Capabilities via Controller
Access controller only In stand alone applications a modem can be connected to allow dial-in from a remote PC.
Access controller plus additional controllers on network segment / LAN
Access all controllers on system
No access available on this controller
Controller Access Devices
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Zone-Based Interface Access
Zone Interface Hardware
Zone-Mounted touchpad (thermostat or stand-alone display)
HID (proprietary device)
PDA (3rd party HID, with software)
Other Information not provided.
*Note: This section covers the capabilities for accessing the controller or other parts of the network from the controller (i.e. 'bottom-up').
Standard access functionality is covered in the Architecture and Software sections.
**Does NOT include front-end OI functions. See vendor for specific functions available.
Functions Available Through Field Interface**:View ParamsChange ParamsChange
O&M SupportTAB/Cx Support
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Microprocessor(s) Information not provided.
Clock Type
Powered, battery-backed
Battery powered
Powered, no battery backing
Clock Synchronization The ASIC/2-8040-BAC can broadcast time on the network to synchronize time on networks or ASIC/2 or ASIC/1 controllers.
Volatile Memory (RAM) Capacity Information not provided.
Volatile Memory (RAM) Uses
RAM use unrestricted
RAM use restricted as shown below
Information Not Provided
Program Execution / Calculation storage
Data / Trends / Alarms storage
Configuration / Parameter storage
Control Programming storage
Others Information not provided.
Is Volatile Memory Supported By Battery? No.
Battery Type(s) Information not provided.
Battery Life Information not provided.
Backup Battery Operating Time Information not provided.
Non-Volatile Memory Capacity (EEPROM/Flash)* 128 kb Flash
Non-Volatile Memory Uses
Data / Trends / Alarms / Calculation Storage
Configuration / Parameter Storage
Control Programming Storage
Controller Operating System
Additional Information
* Items in NV memory are not lost upon power or battery failure. Other types of NV memory such as EPROM, NOVROM, etc. do not directly impact system performance.
Can trend data be stored in this controller?
How many total trend values can be stored? 128 words, or 256 bytes for each trend.
Multiple trends based on memory available.
What is the controllers role in trending? Samples on periodic basis.
Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller? Information not provided.
When full, does controller automatically send up trend data, overwrite data, or stop logging data? Rollover or stop depending on configuration.
Programming Method(s) Configured using ASI Visual Expert, a Windows based software.
Resident vs Non-Resident Program Execution Resident
Resident/Supervisory. This controller supervises the scheduling of other controllers.
Resident/Stand Alone. This controller contains its own schedule.
Non-Resident. This controller is dependent upon another controller for its schedule.
None. This controller has no scheduling features.
Resident Energy Management
Energy management algorithms for this controller can be custom programmed
Pre-programmed/built-in algorithms available, and are fully editable using custom programming
Pre-Programmed/built-in with limited editing via template-based programming
Controller is not typically used for energy management functions
Specific Pre-Programmed Algorithms Available
None (custom programming only)
None (not applicable)
Optimal Start/Optimal Stop
Peak Demand Limiting/Load Shedding
Economizer (enthalpy, dry-bulb, CO2, modulating/2-position, etc.)
Additional Energy Management functions are resident at SI
Additional Programming Functions
DDC Loops (P, PI, PID) PID
Automatic PID Tuning Feature
Yes, Override PID for Step Response to assist loop tuning.
Automatical-Dial Alarm Support Yes.
Does controller perform multiple retries and buffer/store alarm until connection is made? Yes.
Are multiple destinations possible? Yes.
Upon controller power loss or hardware failure:
Are network communications affected?

Information not provided
Is loss recognized on/by the network and alarm reported?

Information not provided
DO and AO response?
Outputs fail to a user pre-specified position
Outputs fail to a normal (unpowered) position
Outputs fail to last position
Volatile memory functions?
Retained for life of backup battery
Upon restoration of power does the controller:
Auto-reboot without operator intervention?

Controller does power-up test and then resumes normal operation.
Automatically reset/synchronize the clock? Automatic synchronization.
Update all monitored functions?

Dynamic Trends restart,
Static Trends continue.
Generate an alarm if backup battery is dead? No.
Upon network or communications failure does controller:
Continue to operate standalone? Yes.
Operate with last global settings or user-specified value? N.A.
Do broken network segments continue to communicate within the remaining segment?
(Note: May depend on proper termination of segments for higher speed networks.)
Yes, failed controller is skipped.
Does network automatically reconfigure upon restoration? No.
Does network store 'loss of communications' alarm with time of event? Available through User Interface.
Additional Information (optional)
Self Test Diagnostics
Does controller have internal self-test diagnostics to check:
Processor failure? Information not provided
Internal hardware failure?

Self test of internal memory, and power check on power-up.
Open/shortened sensor?

Inputs have Fault Limits.
Control Enclosure Provided.
Power Supply Required
Voltage 24 VAC +/- 15%
VA 17 VA (plus loads)
Surge Protection 1.35 A Polyswitch & MOV
Underwriters Laboratories UL-916
FCC Meets FCC Requirements
CE Meets CE Requirements
LonMark Certified
No - but LonWorks compatible
Information not provided
BACnet (BTL) Certified
Not submitted for testing
Information not provided